#!/bin/bash
#
# script: rc.6
#
# This file is executed by init when it goes into runlevel 0 (halt) or runlevel 6 (reboot).
# It kills all processes, unmounts file systems and then either halts or reboots.
#
# Version: 2.47 Sat Jan 13 13:37:26 PST 2001
#
# Author:  Miquel van Smoorenburg <miquels@drinkel.nl.mugnet.org>
#          Modified by: Patrick J. Volkerding, <volkerdi@slackware.com>
#
# LimeTech - modified for Unraid OS
# Bergware - modified for Unraid OS, October 2023

# Set the path.
PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin

# run & log functions
. /etc/rc.d/rc.runlog

# If there are SystemV init scripts for this runlevel, run them.
if [[ -x /etc/rc.d/rc.sysvinit ]]; then
  /etc/rc.d/rc.sysvinit
fi

# Set linefeed mode to avoid staircase effect.
/bin/stty onlcr

log "Running shutdown script $0:"

# Find out how we were called.
case "$0" in
*0)
  SHUTDOWN_COMMAND="halt"
  ;;
*6)
  SHUTDOWN_COMMAND="reboot"
  ;;
*)
  /bin/echo "$0: call me as \"rc.0\" or \"rc.6\" please!"
  exit 1
esac

# Restart init. This prevents init from hanging on to file handles for removed
# glibc shared libraries in the case that those were upgraded or reinstalled.
/sbin/telinit u

# Save the system time to the hardware clock using hwclock --systohc.
# This will also create or update the timestamps in /etc/adjtime.
if [[ -x /sbin/hwclock ]]; then
  # Check for a broken motherboard RTC clock (where ioports for rtc are
  # unknown) to prevent hwclock causing a hang:
  if ! /bin/grep -q " : rtc" /proc/ioports; then
    CLOCK_OPT="--directisa"
  fi
  if [[ /etc/adjtime -nt /etc/hardwareclock ]]; then
    if /bin/grep -q "^LOCAL" /etc/adjtime; then
      log "Saving system time to the hardware clock (localtime)."
    else
      log "Saving system time to the hardware clock (UTC)."
    fi
    run /sbin/hwclock $CLOCK_OPT --systohc
  elif /bin/grep -q "^UTC" /etc/hardwareclock 2>/dev/null; then
    log "Saving system time to the hardware clock (UTC)."
    if [[ ! -r /etc/adjtime ]]; then
      log "Creating system time correction file /etc/adjtime."
    fi
    run /sbin/hwclock $CLOCK_OPT --utc --systohc
  else
    log "Saving system time to the hardware clock (localtime)."
    if [[ ! -r /etc/adjtime ]]; then
      log "Creating system time correction file /etc/adjtime."
    fi
    run /sbin/hwclock $CLOCK_OPT --localtime --systohc
  fi
fi

# Run any local shutdown scripts:
if [[ -x /etc/rc.d/rc.local_shutdown ]]; then
  /etc/rc.d/rc.local_shutdown stop
fi

# Stop mcelog
if [[ -x /etc/rc.d/rc.mcelog ]]; then
  /etc/rc.d/rc.mcelog stop
fi

# Stop the Samba server:
if [[ -x /etc/rc.d/rc.samba ]]; then
  /etc/rc.d/rc.samba stop
fi

# Stop avahi:
if [[ -x /etc/rc.d/rc.avahidaemon ]]; then
  /etc/rc.d/rc.avahidaemon stop
  /etc/rc.d/rc.avahidnsconfd stop
fi

# Shut down WireGuard
if [[ -x /etc/rc.d/rc.wireguard ]]; then
  /etc/rc.d/rc.wireguard stop
fi

# Shut down OpenLDAP:
if [[ -x /etc/rc.d/rc.openldap ]]; then
  /etc/rc.d/rc.openldap stop
fi

# Shut down the SASL authentication daemon:
if [[ -x /etc/rc.d/rc.saslauthd ]]; then
  /etc/rc.d/rc.saslauthd stop
fi

# Stop the MySQL database:
if [[ -x /etc/rc.d/rc.mysqld && -r /var/run/mysql/mysql.pid ]]; then
  /etc/rc.d/rc.mysqld stop
fi

# Shut down the NFS server:
if [[ -x /etc/rc.d/rc.nfsd ]]; then
  /etc/rc.d/rc.nfsd stop
fi

# Shut down the SSH server:
if [[ -x /etc/rc.d/rc.sshd ]]; then
  /etc/rc.d/rc.sshd stop
fi

# Stop the Network Time Protocol daemon:
if [[ -x /etc/rc.d/rc.ntpd ]]; then
  /etc/rc.d/rc.ntpd stop
fi

# Kill any processes (typically gam) that would otherwise prevent
# unmounting NFS volumes:
unset FUSER_DELAY
for DIR in $(/bin/mount | /bin/grep -e 'type nfs ' -e 'type nfs4 ' | /bin/sed -e 's|.* on ||g' | /bin/cut -d ' ' -f 1); do
  log "Killing processes holding NFS mount $DIR open..."
  # Background this to prevent fuser from also blocking shutdown:
  run /usr/bin/fuser -k -M -m "$DIR" &
  FUSER_DELAY=5
done
# If fuser was run, let it have some delay:
if [[ -n $FUSER_DELAY ]]; then
  /bin/sleep $FUSER_DELAY
fi

# Unmount any NFS, SMB, or CIFS filesystems:
log "Unmounting remote filesystems:"
/bin/umount -v -a -l -f -r -t nfs,nfs4,smbfs,cifs | /bin/tr -d ' ' | /bin/grep successfully | /bin/sed "s/:successfullyunmounted/ has been successfully unmounted./g" | log
# Update PATH hashes:
hash -r

# Stop D-Bus:
if [[ -x /etc/rc.d/rc.messagebus ]]; then
  /etc/rc.d/rc.messagebus stop
fi

# Bring down the networking system, but first make sure that this
# isn't a diskless client with the / partition mounted via NFS:
if ! /bin/mount | /bin/grep -q -e 'on / type nfs' -e 'on / type nfs4'; then
  if [[ -x /etc/rc.d/rc.inet1 ]]; then
    /etc/rc.d/rc.inet1 stop
  fi
fi

# In case dhcpcd might have been manually started on the command line,
# look for the .pid file, and shut dhcpcd down if it's found:
if /bin/ls /etc/dhcpc/*.pid &>/dev/null; then
  /sbin/dhcpcd -k &>/dev/null
  # A little time for /etc/resolv.conf and/or other files to
  # restore themselves.
  /bin/sleep 2
fi

# Turn off process accounting:
if [[ -x /sbin/accton && -r /var/log/pacct ]]; then
  /sbin/accton off
fi

# Terminate acpid before syslog:
if [[ -x /etc/rc.d/rc.acpid && -r /var/run/acpid.pid ]]; then # quit
  /etc/rc.d/rc.acpid stop
fi

# Stop udev:
if [[ -x /etc/rc.d/rc.udev ]]; then
  /etc/rc.d/rc.udev force-stop
fi

# Kill all remaining processes (including rsyslogd)
OMITPIDS="$(for P in $(/usr/bin/pgrep mdmon); do /bin/echo -o $P; done)" # Don't kill mdmon
if [[ $1 != fast ]]; then
  log "Sending all processes the SIGTERM signal."
  run /sbin/killall5 -15 $OMITPIDS
  /bin/sleep 5
  log "Sending all processes the SIGKILL signal."
  run /sbin/killall5 -9 $OMITPIDS
fi

# limetech - let's keep this on the USB flash
# Carry a random seed between reboots.
/usr/sbin/seedrng
/bin/cp -f /var/lib/seedrng/seed.credit /boot/config/random-seed 2>/dev/null

# If "Mirror syslog to flash" is disabled and "Copy" is enabled (default) then copy current syslog to flash
# The copied file will become /boot/logs/syslog-previous after next boot (see rc.M)
# Safety feature: copy only when enough space is available on the flash device
CFG=/boot/config/rsyslog.cfg
[[ -r $CFG ]] && MIRROR=$(/bin/grep -Pom1 '^syslog_flash="\K[^"]+' $CFG)
[[ -r $CFG ]] && COPY=$(/bin/grep -Pom1 '^syslog_shutdown="\K[^"]+' $CFG)
if [[ ! -f /boot/logs/syslog && -z $MIRROR && -z $COPY ]]; then
  AVAIL=$(/bin/df --output=avail /boot | /bin/awk '(NR>1){print $1*1024;exit}')
  SIZE=$(($(/bin/stat -c%s /var/log/syslog)*2))
  if [[ $AVAIL -ge $SIZE ]]; then
    log "Saving syslog to flash"
    /bin/cp -f /var/log/syslog /boot/logs/syslog
  fi
fi

# Before unmounting file systems write a reboot or halt record to wtmp.
/sbin/$SHUTDOWN_COMMAND -w

# Turn off swap:
if [[ ! $(/bin/cat /proc/swaps | /bin/wc -l) == 1 ]]; then
  log "Turning off swap."
  run /sbin/swapoff -a
  run /bin/sync
fi

# Unmount local file systems:
# limetech - but not /, /lib, /usr or /boot (yet)
log "Unmounting local file systems:"
EXCLUDE_TYPES=("proc" "sysfs" "tmpfs" "devtmpfs" "devpts" "nfsd")
EXCLUDE_PATHS=("/" "/lib" "/usr" "/boot")
while IFS= read -r LINE; do
  MOUNT_TYPE=$(/bin/echo "$LINE" | awk '{print $3}')
  MOUNT_PATH=$(/bin/echo "$LINE" | awk '{print $2}')
  [[ " ${EXCLUDE_TYPES[@]} " =~ " $MOUNT_TYPE " ]] && continue
  [[ " ${EXCLUDE_PATHS[@]} " =~ " $MOUNT_PATH " ]] && continue
  run /bin/umount -v "$MOUNT_PATH"
done <<< "$(/bin/cat /proc/mounts)"
# Update PATH hashes:
hash -r

# limetech - shut down the unraid driver if started
if /bin/grep -qs 'mdState=STARTED' /proc/mdstat; then
  log "Stopping md/unraid driver:"
  /bin/echo "stop" >/proc/mdcmd
  if /bin/grep -qs 'mdState=STOPPED' /proc/mdstat; then
    log "Clean shutdown"
    /bin/rm -f /boot/config/forcesync
  else
    log "Unclean shutdown - Cannot stop md/unraid driver"
  fi
fi

# This never hurts:
/bin/sync

log "Remounting /boot read-only:"
run /bin/mount -v -o remount,ro /boot

log "Remounting /lib read-only:"
run /bin/mount -v -o remount,ro /lib

log "Remounting /usr read-only:"
run /bin/mount -v -o remount,ro /usr

log "Remounting root filesystem read-only:"
run /bin/mount -v -n -o remount,ro /

# Update PATH hashes:
hash -r

# sleep 3 fixes problems with some hard drives that don't
# otherwise finish syncing before reboot or poweroff
/bin/sleep 3

# This is to ensure all processes have completed on SMP machines:
wait

if [[ -x /sbin/genpowerd ]]; then
  # See if this is a powerfail situation:
  if /bin/grep -Eq "FAIL|SCRAM" /etc/upsstatus 2>/dev/null; then
    # Signal UPS to shut off the inverter:
    run /sbin/genpowerd -k
    if [[ $? != 0 ]]; then
      log "There was an error signaling the UPS."
      log "Perhaps you need to edit /etc/genpowerd.conf to configure"
      log "the serial line and UPS type."
      # Wasting 15 seconds of precious power:
      /bin/sleep 15
    fi
  fi
fi

# Now halt (poweroff with APM or ACPI enabled kernels) or reboot.
if [[ $SHUTDOWN_COMMAND == reboot ]]; then
  log "Rebooting."
  run /sbin/reboot
else
  log "Powering off."
  run /sbin/poweroff
fi
